John and Jay run the 220-yard dash ,and Jay wins the race by

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John and Jay run the 220-yard dash ,and Jay wins the race by 10 yards .if Jay runs the race in 30 seconds ,what is the rate of each boy in yards per second?how long would it take John to run the 220-yard dash?

Jay's speed is his distance (220 yd) divided by his time (given in question).John's speed is his distance (10 yds short of the total distance) divided by the time,which is when Jay's finishes (30 secs).Once you get John's speed,his total time can be found by:time = 220/his speed.
再问：您能不能给我翻译成中文！和步骤！谢谢
再答：不好意思, 我还以为你要的是英文写出来的步骤, 我说的部份就是如何去推算了, 翻译过来是: 杰的速度是他的距离（220码）除以他的时间。约翰的速度是他的距离（总距离短10码）除以时间，也就是杰的完成的时间（30秒）。一旦你得到了约翰的速度，他的总时间，可以此演算出来：时间=220/他的速度。或是你是要这个步骤: T = D/ R R =约翰（码/秒的速度） S =杰（码/秒的速度）所以 220/240=210/R S=220/30

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